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Chassis covers, proper cooling, and airflow: For proper cooling and
airflow, always install the chassis access cover before turning on the system.
Operating the system without this cover in place can damage system parts.
Installing or removing jumpers: A jumper is a small, plastic-encased
conductor that slips over two jumper pins. Newer jumpers have a small tab
on top that you can grip with your fingertips or with a pair of fine, needle-
nosed pliers. If your jumpers do not have such a tab, take care when using
needle-nosed pliers to remove or install a jumper; grip the narrow sides of
the jumper with the pliers, never the wide sides. Gripping the wide sides can
damage the contacts inside the jumper, causing intermittent problems with
the function controlled by that jumper. Take care to gently grip, but not
squeeze, with the pliers or other tool you use to remove a jumper; you might
bend or break the stake pins on the board.
Baseboard
Removing the Baseboard
CAUTIONS
The baseboard can be extremely sensitive to ESD and always requires
careful handling. After removing it from the system, place it
component-side UP on a nonconductive, static-free surface to prevent
shorting out the battery leads. If you place the board on a conductive
surface, the battery leads may short out. This will result in a loss of CMOS
data and will drain the battery. Do not slide the baseboard over any surface.
1. Observe the safety and ESD precautions at the beginning of this chapter.
2. Remove the access cover.
3. Remove the front and rear foam covers.
4. Label and disconnect all internal cables connected to add-in boards.
5. Remove all add-in boards.
6. Label and disconnect all internal cables connected to the baseboard.
NOTE
The baseboard is attached to the electronics bay. In general, the best method
for removing the baseboard is to remove the electronics bay first,
particularly in servers mounted in a pedestal (tower) orientation, though this
is not a requirement.
7. Open the front subchassis and, if necessary, remove the electronics bay. See "Opening the
Subchassis and Electronics Bay" on page 90.
8. Remove the baseboard retaining screws and set them aside.
9. Pull the board toward you slightly to disengage it from two snap-in standoffs, and then slide
the board toward the front of the server until the board's I/O connectors clear the rear of the
chassis.
110
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